Page 10 of 13 · 76 explainers
Knowledge base
More explainers from the knowledge base. Each one names what you need to know first, works through the method, and says where it usually goes wrong.
Distinction AlgebraFactoring vs Quadratic Formula vs Completing the SquareThree methods, one answer. The discriminant decides which is fastest, and it takes a single line to find out.
Mistakes Algebra5 Common Quadratic Formula MistakesFour of the five happen before any real calculating starts, which is why they are so easy to miss on the way back through.
Examples AlgebraQuadratic Formula Examples: 8 Worked ProblemsEight problems, each adding exactly one new difficulty to the one before it.
Formula AlgebraDiscriminant Formula: What b² − 4ac Tells YouOne expression, evaluated before you solve anything, that tells you what kind of answer you are about to get.
Method AlgebraHow to Use the Quadratic Formula: Step by StepFive steps, in order. Four of the five mistakes people make happen in the first two.
Concept AlgebraWhat Is the Quadratic Formula? Where It Comes FromOne formula solves every quadratic there is. It is worth knowing why, because the reason is also the method it replaces.